Gina Guthrie and Sandra Jakubowski were among them. What's more, it's possible that the killer may have had even more victims than anyone realizes. In Phoenix, four white women between the ages of 35 and 50 were strangled from 2006 to 2009. As such, families of the victims aren't exactly hopeful that they will get answers in the immediate future. At that point, only a single detective was investigating the case full-time. Even worse are the murders that are never connected to a serial killer. Think about how many others are operating around the world. Which in and of itself is scary but thats only the U.S. Robert and Helen Sims and their daughter Joy were found bound, gagged, stabbed, and shot in their Tallahassee home on October 22, 1966, WCTV reports. According to statistics, there are anywhere from 25-50 active serial killers in the U.S. 641 Muriel Court, the site of the murders. While there have been at least two potential suspects, as of 2016 there had been zero arrests. FLORIDA: A triple murder in Tallahassee is still unsolved more than 50 years later. Unfortunately, it turned out that the women had been murdered - strangled, possibly - sometime between 20, so the trail was colder than anyone would have wanted. The skeletal remains were discovered in 2009, and as the Albuquerque Journal tells us, the police swiftly put together a 40-strong task force to investigate the case. The West Mesa Serial Killer is an unapprehended and unknown individual who murdered 11 young women, one of whom was pregnant, and buried them in clumsy graves in West Mesa, Albuquerque. and, seeing as he still hasn't been caught, might still be. As such, some people who are extremely familiar with the case, such as crime journalist Mario Spezi, believed in 2006 that the true Monster of Florence (or perhaps monsters) was still out there. His conviction was promptly overturned, but soon afterward, the police discovered a witness who claimed that Pacciani and a number of accomplices had in fact been killing people at the behest of a devil-worshiping doctor and other "masterminds." Pacciani died before his second trial, and though two of his apparent accomplices were eventually convicted, the evidence against them was shoddy at best. In 1994, the investigators finally believed they had their man, in the form of a drunken, violent farm worker called Pietro Pacciani. Details: The Butcher of Kingsbury Run was an unidentified serial killer who killed and dismembered at least twelve victims from among the homeless of. The husband of the first victim was actually convicted for the murder and received a 14-year prison sentence, though the killings soon resumed. As the Atlantic tells us, the hunt for the Monster was a long one, and tens of thousands of men were viewed as potential suspects.